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With PTFE / silicone seal made of PPS (polyphenylene sulphide). With PTFE / silicone seals having a particularly high level of mechanical resistance, even in temperatures up to +250°C. The non-slip, knurled outer surface ensures the screw cap can be closed securely and opened easily. The closure incorporates a PTFE-faced silicone seal wad and the substance in the container only comes in contact with PTFE. The silicone wad levels out any unevenness in the container neck.For thread size 32 GL